|
Post by fillthyanimal75 on Oct 19, 2018 11:23:25 GMT -5
I keep hearing about Pressuring motors and transmissions but what is it and how do you do it?
|
|
owen11x
Feature Winner
Ford makes it, Chevy shakes it, Mopar breaks it!
Posts: 2,579
|
Post by owen11x on Oct 19, 2018 12:05:39 GMT -5
Pressure is a great thing. Though it comes in a few ways. Weld class and chain/no protector class
Both are same concept. Different excecution
Weld class. You hold pressure down and out and your frame with front wheels hanging free and off the ground with jack stands towards center of car at least by xmember, set engine and trans in , weld your doors to your rockers. Then you take a porta power and start pushing your engine and trans with all your protectors on. Shove that straight back into the body pretty tights then you can tighten your body bolts and suck body down around your trans brace and finish welding it and may I add. You do not have your xmember in at this time of shoving it in, once you have it fully pressured in then you weld your square tube crossmember in. Been a few years since ive built a weld car but that's how I went about it.
Chain class same kinda deal. Except without all the extra protector steps. Just keep weight on and out on frame as you set motor in. Weld clip on while having downward pressure on frame. Everyone does this different I'm sure so people will change and add to how i do it. But this is a generalization
|
|
owen11x
Feature Winner
Ford makes it, Chevy shakes it, Mopar breaks it!
Posts: 2,579
|
Post by owen11x on Oct 19, 2018 12:21:20 GMT -5
May I also add. this is for full size rwd cars.. I've ran one bone stock w body so I know nothing about Compact or midsize builds
|
|
Landshark007
Feature Winner
I'm not here to win I'm here to make sure you don't win
Posts: 4,228
|
Post by Landshark007 on Oct 19, 2018 21:13:35 GMT -5
I guess even I get to learn something new today š³
|
|
|
Post by DerbyKing88s on Oct 19, 2018 22:37:34 GMT -5
Owen hit it on the head, everyone has different steps or different ways of going about it but the idea is the same. You are really only limited by your creativity, for our protector type cars, we āpreloadā the crossmember, the way we do that is take our 2x2 cross member or whatever size it is and form an arch shape out of it, we make ours so the arch is toward the front of the car, some make it so the arch is towards the back, either way it makes it so canāt or is less likely to bend backward as the front of the car wants to come up. The reason we do ours with arch forward is because I realized that if the arch is backwards, the pressure of the front wanting to come up could break the welds ir just rip the frame off where the crossmember is welded to it. With the arch being forward, in order for the cross member to bend back is if it blows the frame outward, which i guess could happen. Pressuring doesnāt just stop at the motor and trans, you can do it with ur gas tank protector to the package trey and if you have a pinion brake cover, you can pressure that into the floor or package trey.
|
|
owen11x
Feature Winner
Ford makes it, Chevy shakes it, Mopar breaks it!
Posts: 2,579
|
Post by owen11x on Oct 19, 2018 22:47:45 GMT -5
Good point I was giving a general outlook but the point is. Get creative. I do my crossmember the same as stated above. I make mine so as things push back it forces the side rails out into the rockers.. But I'm not giving away every secret either lol. Pre loading and pressuring can be used in many ways in derby cars. Study the car. Look at things and question yourself. You'll be surprised What you can learn yourself like Sean said. Its open to your imagination.
|
|
|
Post by Jeffrey7x on Oct 19, 2018 22:49:31 GMT -5
Aside from m/t pressuring, thereās more ways pressure is debatably beneficial throughout a build.
For example i, and Iām sure many others, use pressure when mounting bumpers, by sucking the rails closer together by means of a comealong or hydraulic pull-back ram, then welding the bumper on. Front and rear.
Getting creative with this allows you to twist the tops of rails inward or outward (helpful in achieving a nice tight roll imo).
|
|
owen11x
Feature Winner
Ford makes it, Chevy shakes it, Mopar breaks it!
Posts: 2,579
|
Post by owen11x on Oct 19, 2018 22:56:44 GMT -5
Yep i suck the fronts in. Never done rear rails. I could see that being touchy depending on makes and models. Like myself I run mopars and metric caddys for most part so that Wouldn't benefit me to do the rears. This thread could get interesting
|
|
|
Post by DerbyKing88s on Oct 19, 2018 23:02:08 GMT -5
Right, depending on how much people want to give away. Iāve never done the front rails, could one of you explain what that does? We suck the rear rails in on coil sprung cars that are dished so it has a nice tight roll and nothing blows outward, Iām pretty sure it helps the humps in the fact that if they do blow, the donāt blow out and get into the tires
|
|
|
Post by DerbyKing88s on Oct 19, 2018 23:06:08 GMT -5
Not sure if it was mentioned but part of the pressure process with the front and hanging is the front clip, a reinforced clip helps, some are easier to strengthen than others
|
|
owen11x
Feature Winner
Ford makes it, Chevy shakes it, Mopar breaks it!
Posts: 2,579
|
Post by owen11x on Oct 19, 2018 23:06:37 GMT -5
Suck front rails in and it transfers the bend energy back further. Makes a sight diamond effect, if you sit and look at it from above and think about the physics and applied force it'll make sense to you.
|
|
|
Post by DerbyKing88s on Oct 19, 2018 23:09:34 GMT -5
Oh ok ya I gotcha, I would assume suck together slightly, nothing crazy
|
|
Landshark007
Feature Winner
I'm not here to win I'm here to make sure you don't win
Posts: 4,228
|
Post by Landshark007 on Oct 19, 2018 23:12:43 GMT -5
I don't do rears
|
|
owen11x
Feature Winner
Ford makes it, Chevy shakes it, Mopar breaks it!
Posts: 2,579
|
Post by owen11x on Oct 19, 2018 23:13:31 GMT -5
Oh ok ya I gotcha, I would assume suck together slightly, nothing crazy Correct. Nothing crazy
|
|
|
Post by DerbyKing88s on Oct 19, 2018 23:16:51 GMT -5
Some cars would be a little harder to do, like ur caddy you would have to cut the core support brace and make a little narrower but letās say you were to do it, it would transfer more of the pressure to the firewall where in theory the dp is pressured in, plus you could tie in your dog bones and have the arched cross memeber, pretty solid idea. On a caddy I donāt think itās as necessary because they donāt really go in front of the a arms especially in a full weld class where u get plates to the a arms. I definitely could see the potential benefits thanks for clarifing
|
|